Why Choose the Mersen NH4AM69V800-8 Motor Fuse Link?
The Mersen NH4AM69V800-8 is a heavy-duty DIN NH aM fuse link designed specifically for short-circuit protection in high-power industrial motor circuits. Manufactured by Mersen, this NH Size 4 fuse link delivers exceptional current-limiting performance, protecting large motors, motor starters, contactors and associated electrical equipment from damaging fault currents while maintaining reliable operation in demanding industrial environments.
With a rated current of 800 A and a 690 V AC voltage rating, the NH4AM69V800-8 is engineered to withstand the high inrush currents associated with motor starting while providing rapid interruption of severe short-circuit faults. Its aM operating class makes it ideal for motor protection systems that incorporate a separate overload relay or motor protection circuit breaker.
Manufactured in the standard NH Size 4 format, this fuse link features blade contacts, live gripping lugs and a top-mounted operation indicator. Its robust ceramic construction, high breaking capacity and compliance with IEC standards make it suitable for heavy industrial motor control centres, switchgear and low-voltage power distribution systems.
Key Advantages
- Designed specifically for industrial motor short-circuit protection.
- 800 A rated current for large motor applications.
- 690 V AC rated voltage for demanding industrial power systems.
- High current-limiting performance helps minimise fault energy.
- Designed to withstand normal motor starting currents.
- Top-mounted indicator enables rapid identification of fuse operation.
- Live gripping lugs support safe replacement using approved NH fuse handling tools.
Key Features
- Mersen NH fuse-links aM 690 VAC series.
- NH Size 4.
- 800 A rated current.
- 690 V AC rated voltage.
- Partial-range aM operating class.
- Top-mounted fuse operation indicator.
- Live gripping lugs.
- Blade contact construction.
- 100 mm body width.
- High breaking capacity of 120 kA.
Reliable Short-Circuit Protection for High-Power Motors
The Mersen NH4AM69V800-8 is designed for the protection of high-power motors by rapidly interrupting severe fault currents while tolerating the temporary inrush currents generated during normal motor starting. Its advanced current-limiting characteristics help reduce thermal and mechanical stress on motors, conductors and switching equipment.
As an aM partial-range fuse, the NH4AM69V800-8 provides short-circuit protection only. It should always be coordinated with a suitable overload relay or motor protection circuit breaker to achieve complete motor protection.
Typical Applications
- High-power motor starter circuits.
- Motor control centres.
- Heavy industrial machinery.
- Mining and processing equipment.
- Large pumps, compressors and conveyors.
- Industrial switchgear and low-voltage distribution systems.
